Wheaton Regional Park Carousel and (working) Miniature Train, 3 Amigos Restaurant

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Great Carousel and Train.  The train goes through a tunnel and over a bridge which kids love. 

The nearby brookside botanical gardens are a great place for a picnic.

http://www.montgomeryparks.org/enterprise/park_facilities/trains/wheaton.shtm

Three Amigos has everything that makes a place your favorite: subtle design touches, interesting people, and of course - great food. We were here for lunch after a trip to the Wheaton Train and Carousel and had a great meal. It had a bar so I can't speak to what the scene is in the evening.